mwvsciencefair - Red Eye Camera Flash

Title:

Red Eye

Problem Scenario:

I want to find out how light effects red eye so other people could prevent it when they take pictures of their own.

Broad Question:

How does light effect red eye?

Specific Question:

How does different light settings make red eye show up more or less?

Hypothesis:

If the light in the room is darker then the red eye will show up more because the darker the room or area is the wider the pupils will get to allow more light into the eye to help you see.

Graph of Hypothesis:

Variables

Independent Variable:

How much light there is in the room.

Dependent Variable:

How much red eye shows up in the pictures.

Variables That Need To Be Controlled:

Picture taken in natural light.

Vocabulary List That Needs Explanation:

Camera: A device used to take pictures.
Pictures: A piece of paper with an image on it taken with a camera.
Red Eye: Redness that appears in pictures when the flash is on.

General Plan

Potential Problems And Solutions: I could brake the camera, to prevent that I will wear a strap.

Safety Or Environmental Concerns

Experimental Design

(add the correct headings from the experimental design page before beginning)

Resources and Budget Table

Item	Number needed	Where I will get this	Cost
Camera	One	My Family	$0.00

Detailed Procedure:

1.) Get Camera

2.)Take picture in natural light - with no flash

3.) Take picture in dimmed light - with no flash

4.) Take picture with very little light - with no flash

5.) Repeat procedure with flash on

6.) Compare pictures

Diagram:

Photo List

People standing in different shades of light.

Time Line

February 23, 2013 - start project ----- March ?, 2013 end project

Data Table

Data Analysis

All Raw Data:

Graphs:

Results:

Most of the pictures do not have red eye, but some have a ring of light red around the eye. I have noticed that in all of the pictures the pupil is pure white instead of black. My hypothesis was wrong, I thought there would be more red eye when it was darker but it is mostly the same throughout all the pictures.

Conclusion:

The darker light settings did have more red eye in the pictures. There were some pictures in lighter setting that did have more red eye than others. It wasn't a big difference in color but they weren't all the exact same color.

Discussion:

Benefit to Community and/or Science: Since technology has gotten better they now make cameras that have a two flashes. The first flash takes the red eye away and the second flash takes the actual picture. If there weren't any cameras that had a red eye effect this project would tell people what setting if light would be be best to take pictures in so they won't get any red eye.

Background Research

Red Eye only appears when the flash is on. It happens when the flash on the camera reflects off of the pupil and the blood vessels in you eye. If you are in a darker room your pupils get bigger and it is more likely for the red eye to appear. If you don't want to have red eye in a picture you can look at something brighter because it will make your pupils smaller and it will be less likely to happen. When you take pictures of animals you will notice they will rarely have Red Eye. That is because their eyes are much different than humans. When you take photos of animals, the Red Eye effect isn't usually red. Animals have a reflective layer in the back of their eyes behind the retina called the tapetum. This layer enhances their night vision. The color of the tapetum gives you a blue, green. yellow, or white eye effect. With animals, the effect can take place even when the ambient light is sufficient to prevent it in humans.